import sys
import pygame

from settings import Settings
from bullet import Bullet
from ship import Ship

class SidewaysShooter:
    def __init__(self):

        pygame.init()
        self.clock = pygame.time.Clock()
        
        self.settings = Settings()
        self.screen = pygame.display.set_mode((self.settings.screen_width,
                                               self.settings.screen_height))

        pygame.display.set_caption("Sideways Shooter")

        self.bg_color = (self.settings.bg_color)
        self.ship = Ship(self)
        self.bullets = pygame.sprite.Group()

    def run_game(self):
        while True:
            self._check_events()
            self.ship.update()
            self._update_bullet()
            self._update_screen()
            self.clock.tick(60)


    def _check_events(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            elif event.type == pygame.KEYDOWN:
                self._check_keydown_events(event)
            elif event.type == pygame.KEYUP:
                self._check_keyup_events(event)
                

    def _check_keydown_events(self,event):
        if event.key == pygame.K_UP:
            self.ship.moving_up = True
        elif event.key == pygame.K_DOWN:
            self.ship.moving_down = True
        elif event.key == pygame.K_q:
            sys.exit()
        elif event.key == pygame.K_SPACE:
            self._fire_bullet()


    def _check_keyup_events(self,event):
        if event.key == pygame.K_UP:
            self.ship.moving_up = False
        elif event.key == pygame.K_DOWN:
            self.ship.moving_down = False


    def _fire_bullet(self):
        if len(self.bullets) < self.settings.bullet_allowed:
            new_bullet = Bullet(self)
            self.bullets.add(new_bullet)


    def _update_bullet(self):
        self.bullets.update()

        for bullet in self.bullets.copy():
            if bullet.rect.left >= self.screen.get_rect().right:
                self.bullets.remove(bullet)


    def _update_screen(self):
        self.screen.fill(self.settings.bg_color)
        for bullet in self.bullets.sprites():
            bullet.draw_bullet()

        self.ship.blitme()
        
        pygame.display.flip()

if __name__ == '__main__':
    ss_game = SidewaysShooter()
    ss_game.run_game()